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Semiconducting halogen-free flame retardant double-wall heat-shrinkable tube and preparation method thereof

A technology of double-wall heat-shrinkable tube and flame retardant, which is applied to cable joints and other directions, can solve the problems of poor flame retardant effect, high cost, low quality of double-wall tube, etc., and achieve significant economic and environmental protection benefits. Performance and cost reduction effect

Inactive Publication Date: 2010-05-05
JIANGSU DASHENG HEAT SHRINKABLE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there are many disadvantages of low quality, high cost or poor flame retardant effect for double-walled tubes with halogen-free flame retardants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A semi-conductive halogen-free flame-retardant double-walled heat-shrinkable tube is composed of an outer wall material and an inner wall material. According to the mass parts, the outer wall material is composed of 43 parts of the first polyolefin mixed resin, 10 parts of conductive carbon black, and the first auxiliary agent is 10 parts and 37 parts of flame retardant; the inner wall material is composed of 53 parts of the second polyolefin mixed resin, 19 parts of the second auxiliary agent and 37 parts of flame retardant;

[0052] In terms of mass percentage: the first polyolefin mixed resin is a polyolefin obtained by melt blending four kinds of polyolefin materials: 1-30% EVA630, 1-20% EVA421, 20-50% EVA283 and 10-30% EVA220 mixed resin;

[0053] The first auxiliary agent is composed of paraffin wax, antioxidant, anti-copper agent, processing stabilizer and sensitizing crosslinking auxiliary agent, wherein the antioxidant tetrakis (β-(3,5-di-tert-butyl-4-hydroxybe...

Embodiment 2

[0084] A semi-conductive halogen-free flame-retardant double-walled heat-shrinkable tube is composed of an outer wall material and an inner wall material. According to the parts by mass, the outer wall material is composed of 43 parts of the first polyolefin mixed resin, 10 parts of conductive carbon black, and the first auxiliary agent is 10 parts and 37 parts of flame retardant; the inner wall material is composed of 53 parts of the second polyolefin mixed resin, 19 parts of the second auxiliary agent and 37 parts of flame retardant;

[0085] In terms of mass percentage: the first polyolefin mixed resin is a polyolefin mixed resin prepared by melt blending four kinds of polyolefin materials: 15% EVA630, 20% EVA421, 45% EVA283 and 20% EVA2200;

[0086] The first auxiliary agent is composed of paraffin wax, antioxidant, anti-copper agent, processing stabilizer and sensitizing crosslinking auxiliary agent, wherein the antioxidant tetrakis (β-(3,5-di-tert-butyl-4-hydroxybenzene ...

Embodiment 3

[0117] A semi-conductive halogen-free flame-retardant double-walled heat-shrinkable tube is composed of an outer wall material and an inner wall material. According to the mass parts, the outer wall material is composed of 43 parts of the first polyolefin mixed resin, 10 parts of conductive carbon black, and the first auxiliary agent is 10 parts and 37 parts of flame retardant; the inner wall material is composed of 53 parts of the second polyolefin mixed resin, 19 parts of the second auxiliary agent and 37 parts of flame retardant;

[0118] In terms of mass percentage: the first polyolefin mixed resin is a polyolefin mixed resin prepared by melt blending four kinds of polyolefin materials: 30% EVA630, 20% EVA421, 40% EVA283 and 10% EVA220;

[0119] The first auxiliary agent is composed of paraffin wax, antioxidant, anti-copper agent, processing stabilizer and sensitizing crosslinking auxiliary agent, wherein the antioxidant tetrakis (β-(3,5-di-tert-butyl-4-hydroxybenzene base...

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PUM

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Abstract

The invention relates to a heat-shrinkable tube, in particular to a semiconducting halogen-free flame retardant double-wall heat-shrinkable tube and a preparation method thereof. The tube consists of an outer wall material and an inner wall material. In parts by weight, the outer wall material contains 43 parts of first polyolefin mixed resin, 10 parts of graphitized carbon black, 10 parts of first assistant and 37 parts of flame retardant, and the inner wall material contains 53 parts of second polyolefin mixed resin, 10 parts of second assistant and 37 parts of flame retardant. The preparation method comprises the following steps of: preparing the inner and the outer wall materials of the double-wall heat-shrinkable tube, extruding, irradiating and expanding molding. Compared with traditional shrinkable tubes, the double-wall heat-shrinkable tube has the technical characteristics that the special halogen-free flame retardant is employed in the raw material, and therefore, products have good flame retardant effect, high temperature resistance and good performance, and the pollution can not be generated even if the products are burnt; the cost is lowered, obvious economic benefits and environmental protection effects are obtained, thereby being suitable for large-scale popularization and application.

Description

1. Technical field: [0001] The invention relates to a heat-shrinkable tube, in particular to a semiconducting halogen-free flame-retardant double-wall heat-shrinkable tube and a preparation method thereof. 2. Background technology [0002] The heat-shrinkable double-walled tube currently on the market has an inner and outer two-layer structure, which is composed of a flame-retardant polymer outer layer with a shape memory function that can shrink radially after heating and an inner rubber layer that can melt and flow at the shrinkage temperature. After heating, the inner adhesive layer melts and flows to fill. It can be widely used in aviation, aerospace, shipbuilding, automobiles, home appliances, communications, petrochemical and other fields. Anti-corrosion, anti-vibration dislocation and other functions. In the formulation of conventional outer layer materials, halogen-containing flame retardants are used, which have the disadvantages of high smoke generation and high t...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K13/06C08K9/06C08K9/04C08K3/22C08K3/34B29C69/02B29C71/04B29B9/00B29C47/02B29C47/92B29C61/02H02G15/18
Inventor 张志强王明志
Owner JIANGSU DASHENG HEAT SHRINKABLE MATERIALS
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